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Chi
Square Calculator - Online

Below you can find a Chi-square calculator. In probability and
statistics, the chi-square distribution with v degrees of
freedom is the distribution of a sum of v2
independent standard normal random variables. It’s one of the most
used probability distributions in inferential statistics.

This spreadsheet calculates the tail-end value for points on a
chi-square (X2) distribution curve. You must
enter the X2 value and the degrees of
freedom.

Chi-square distribution curve

The unshaded area
represents the tail-end
value of X2.
The shaded area
represents the percentile.

The X2
distribution function is calculated using the following formulas:

with v
odd,

with v
even,

where

v = degrees
of freedom

Example: let's calculate percentiles and tail-end
values

A X2
statistic for
a given study was computed to be 3.2 with two degrees of freedom.
What are the tail-end and percentile values?

You enter your data:

Enter degrees of freedom
= 2Enter
chi-square (X2) = 3.2

and get these results:

Tail end value = 0.2019Percentile =
0.7981

Please,
enable JavaScript codes on this page, othewise the calculator won't
work at all.